I"m setting up a 120g tank and am going to run an automated co2 system, and was what size cylinder would be the best for it.any help would be great, thanks
Around here a 15# bottle was only $10 more than a 5# bottle, so it didnt make much sense to go with anything but the 15# unless you were limited in size. Its lasted me a year so far on my 75g but I dont run it that fast.